Burning pulverized fuel.



V. Z. CARACRISTI.

BURNING PULVERIZED FUEL.

APPLICATION FILED MAY 25'. 1914. RENEWED DEC. 27.1916.

1 334,870, Patented Jul 31, 1917.

2 SHEETSSHEET I.

!NVENTOR flzzf g V. Z. CARACRISTI.

BURNING PULVERIZED FUEL.

APPLICATION FILED MAY 25, I914. RENEWED DEC. 27, I916.

1,234,870. Patented July 31, 1917.

2 SHEETSSHEET 2.

9% g g a 4a d I %Z UNITED STATES PATENT OFFICE.

VIRGINIUS z. cARAcRIsTI, or ALBANY, NEW YORK, ASSIGNOR To LOCOMOTIVE PULVERIZED FUEL coMPANY, A coRPoRA'rroN or DELAWARE.

BURNING PULVERIZED FUEL.

Specification of Letters Patent.

Patented July 31, 1917.

Original application filed November 5, 1913, Serial No. 799,269. Divided and this application filed May 25, 1914, Serial No. 840,766. Renewed December 27, 1916. Serial No. 139,186.

To all whom it may concern:

Be it known that I, VIRGINIUS Z. CARA- CRISTI, of Albany, in the county of Albany and State of New York, have invented a certain new and useful Improvement in Burning Pulverized Fuel, of which improvement the following is a specification.

My invention, while relating more particu-larly to burning combustible matter in a coniminuted or finely pulverized state, in the fireboxes of steam boilers, is also applicable for use with gaseous or liquid fuels, and in connection with heating furnaces of other descriptions, and its object is to enable the combustion of fuel of such character to be thoroughly and effectively carried on; the sheets of the firebox to be protected from the direct action of flame of extremely high temperature; and the separation and removal of incombustible residuum to be, continuously effected.

To this end, my invention, generally stated, consists in I a novel method of delivering fuel, in a plurality of bodies or columns, to

a furnace, in the direction of a substantially central locus of combustion therein, and deflecting the flame of the fuel 1n combus t1on in different directions from said locus of combustion toward the rear and top of the furnace. n

The improvementclaimed is hereinafter fully set forth,

In the accompanying drawings: Figure 1 is a vertical longitudinal central section through a locomotive boiler firebox, illustrating one formof means for the practice of my invention; Fig. 2, a transverse section through the same, on the line a a of Fig. 1; and, Fig. 3,21. horizontal section, on

the line b b of Fig. 1.

My invention is hereinexemplified asap ent conduits.

which are used for burning solid fuel not being necessary or applicable. The floor, which is preferably, as shown, downwardly and rearwardly inclined, may be located at any desired level, relatively to the bottom of the firebox, as may be best suited to the depth of the latter, being herein shown as set some distance below the mud. ring, up-

iwardly extending side and end walls of fire,

brick forming a closure for the intervening space. In fireboxes of greater depth, it may lie in or near the plane of the bottom of the mud ring. The top of the floor is downwardly-inclined, from its sides to its middle portion, as shown in Fig. 2, in order to facilitate the discharge of incombustible residuum.

Bodies or columns of pulverized fuel are delivered to the inside firebox, either by be ing forced thereinto, by a fanor pressure blower, or by being: drawn thereinto-by induced draft, through a plurality of conduits, 9,'two or more of which may be applied, and three being shown in the present instance. The several conduits, 9, are adapted for the introduction of air with the fuel, and are so relatively inclined as to discharge the combustible mixture of fuel and air which passes through them, in the direction of what'may be descriptively termed a locus of combustion, which is substantially in the center of the space within'the firebox, and which is indicated bythe reference symbol, m, in Fig. 1 of the drawings. Its position may, however, be changed by variations in the relative velocity .of the columns of mingled fuel and air delivered through differ- The combustible mixture delivered from the conduits is ignited and burns at and near the locus of combustion.

Openings for the ingress of air are formed around the conduits, 9, as shown at the front of the firebox in Fig. 1. Ff- I A baffle-plate or deflector, 10, of fire brick or other suitable refractory material, extends across the firebox, in a plane above the locus of combustion, being supported either on arch tubes, as shown, or on tially horizontal in any longitudinal plane,

except at and near its ends, the forward of which is preferably, as shown, curved or inclined downwardly, and the rear upwardly.

The-primary function of the baffle plate is to prevent a blow pipeor intense concentrated heat action of the gaseous products evolved from the fuel at the locus of combustion, on the firebox sheets, stay bolts, and rivets, and to deflect these products rearwardly and upwardly before they pass to theflues, as well as to deflect the incombustible residuum (ash and impurities) of the fuel toward the floor of the firebox. The baffle plate further serves, by becoming highly heated, as a regenerator, which tends to maintain a substantially constant temperature at the locus of combustion during momentary interruptions of the fuel supply, or when the fuel and air are not thoroughly mixed, and which will, by its.

extremely high heat, effect re-ignition of the combustible mixture if combustion should be momentarily discontinued.

A bridge wall, 11, of fire clay or other refractory material, projects upwardly from the floor, 8, and is-provided for the purposeof enabling an auxiliary supply of air to be admitted to the'firebox, the air passing through a central channel, 11*, in the bridge wall, and being either drawn in directly from the atmosphere or forced in by a blower or other pressure device. The bridge wall becomes highly heated by the combustion in the firebox, and the entering air is preheated thereby in its traverse through the channel, 11. The brid e wall may either extend transversely in the firebox, as shown, or longitudinally, and may be of the full length permissible by the dimensions of the firebox or of less length, as preferred. The discharge opening of the channel, 11, into the firebox, may I extend either entirely or partially throughout the length of the bridge wall, and may be either continuous or divided into a plurality of separated discharge slots.

The impurities which are separated from the fuel by the intense heat of the flame at the locus of combustion, impinge against the baffle plate, 10, and are deposited by gravity on the floor, 8, from which they pass through an opening in the floor into a slag receptacle, 12,1ocated below the flopr, and are granulated by dropping into water,

a a supply of which is maintained in the receptacle. An opening, 11, is formed in the bridge wall, 11, at the bottom thereof, to

permit ,the free traverse of the separated residuum along the floor to the slag receptacle.

It will be obvious to those familiar with the construction and operation of steam boiler furnaces or fireboxes, that a special feature of advantage of my invention, in addition to that of its capability of proi'iding for the effective combustion of pulverized or fluid fuel, is found in its capacity of ready-application in connection with, and as accessory to, fireboxes of any of the various known forms, without modification, in any particular, of their structure, or impairment of their steam generating capability as exerted when used with fuels of other character, in accordance with their original design.

The apparatus herein set forth is not claimed as of my present invention, and the same constitutes the subject matter of a separate application filed by me November 5, 1913, Ser. No. 799,269, of which application my present application is a division.

I claim as my invention and desire to secure by Letters Patent:

1. The improvement in the method of burning pulverized or fluid fuel which consists in delivering a plurality of bodies or columns thereof to a furnace, upwardly and at different relative angles, toward a substantially central locus of combustion therein, and deflecting theflame of the fuel, in aplane above said locus of combustion, from said locus of combustion toward the rear and top of the furnace.

2. The improvement in the method of burning pulverized or fluid fuel which consists in delivering a plurality of bodies or columns thereof to a furnace, upwardly and at different relative angles, towarda substantially central locus of combustion therein deflecting the flame ofthe fuel toward the rear and top of the furnace, separating incombustible residuum by impingement and. gravity, and discharging the separated residuum from the furnace.

3. The improvement in the method of burning pulverized or fluid fuel which consists in delivering a pluraity of bodies or columns thereof to a furnace, upwardly and at different relative angles toward a substantially central locus of combustion therein, deflecting the flame of the fuel, above said locus of combustion, from said locus of combustion toward the rear and top of the furnace, and delivering a supply of preheated air to the furnace, in the direction of the locus of combustion and deflection.

VIRGINIUS Z. CARACRISTI.

Witnesses:

EMILY L. MYERS, G. E. FLODURE. 

